05000338/FIN-2009005-06
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | TS 5.4.1.a, requires in part, that written procedures shall be established per Regulatory Guide 1.33, Appendix A, of which part 6 requires procedures for combating emergencies and other significant events such as acts of nature. Contrary to this, on October 13, 2009, the licensee failed to adequately establish procedure, 0-AP-41, Severe Weather Conditions, Revision 44, such that the SWVH missile shield doors were properly secured. This issue was identified in the licensees CAP as CR346333. A regional Senior Reactor Analyst performed a Phase 3 evaluation under the Significance Determination Process and concluded that the finding was of very low safety significance (Green). The dominant accident sequence involved a postulated tornado causing a non-recoverable Loss of Offsite Power and four of the six Service Water Pumps on site failing due to the performance deficiency. Then operators failed to switch to the Lake to Lake cooling mode. This resulted in a loss of all service water which caused a loss of all cooling to the RCP seals. A seal LOCA ensued without RCS makeup capability since service water provided the ultimate cooling capability for the High Head Safety Injection/Charging pumps. Consequently, core damage happened. For the equipment that failed as a consequence of the performance deficiency no recovery was assumed. Also, an exposure period of eight months was used for the evaluation |
| Site: | North Anna  |
|---|---|
| Report | IR 05000338/2009005 Section 4OA7 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | J Caruso G Johnson D Dempsey J Furia G Dentel J Reece E Knutson G Mccoy R Clagg M Schneider M Balazik A Rao |
| INPO aspect | |
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Finding - North Anna - IR 05000338/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (North Anna) @ 2009Q4
Self-Identified List (North Anna)
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